commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/Quantile.java [284:294]:
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        final double pos = estimationType.index(p, n);
        final int ip = (int) pos;
        final int i = start + ip;

        // Partition and compute
        if (pos > ip) {
            Selection.select(x, start, end, new int[] {i, i + 1});
            return Interpolation.interpolate(x[i], x[i + 1], pos - ip);
        }
        Selection.select(x, start, end, i);
        return x[i];
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commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/Quantile.java [463:473]:
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        final double pos = estimationType.index(p, n);
        final int ip = (int) pos;
        final int i = start + ip;

        // Partition and compute
        if (pos > ip) {
            Selection.select(x, start, end, new int[] {i, i + 1});
            return Interpolation.interpolate(x[i], x[i + 1], pos - ip);
        }
        Selection.select(x, start, end, i);
        return x[i];
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